Python Addin: os module not recognized

[TrilliumLevine1]

Hello All,

I'm running into an issue with a Python Addin.  It's a button with functionality that makes use of the os module.  Naturally I have 'import os' at the top of the button script in the install folder, but when I press the button in Arcmap, I'm getting the following error:

Anyone else have this issue?  Anyone have any ideas?  Feedback greatly appreciated!!!